\documentclass{article}

\usepackage{multirow}
\begin{document}

\begin{table}[!h]
	\centering\renewcommand\arraystretch{1.2}
	\begin{tabular}{c|c|c}
		\hline
		Topic 1 & \multicolumn{2}{c}{Topic 2}    \\
		\hline
		33333   & 44444 & \multirow{2}{*}{55555} \\
		\cline{1-2}
		aaaaa   & bbbbb                          \\
		\hline
	\end{tabular}
	\caption{}
	\label{table:example-app}
\end{table}

\end{document}
